Automatic draft regulator



Feb. 7, 192s..- 1,658,783

w. w. WILLIAMS AUTOMATIC DRAFT REGULATOR Filed April 6. 1921 2 Sheets-Sneet 1 I V5 TOR.

Feb. 7, 1928. w. w. WILLIAMS AUTOMATIC DRAFT REGULATOR 2 Sheets-Sheet 2 Filed April 6. 1921 INVENTOR- Patented Feb. 7, 1952 UNITED STATES PATENT DFFICE.

WALTER 1V. WILLIAMS, OF BLOOMINGTON, ILLINOIS, ASSIGNOR '10 WILLIAMS OIL-O- MATIG HEATING CORPORATION, 01 BLOGMINGTQN, ILLINOIS, A CORPORATION OF ILLINOIS.

AUTOMATIC nnerr rinenrinron.

Application filed April 6, 19.21. Serial No. 459,174.

-My invention relates to automatic draft regulators or more particularly to a special form of draft regulator for use in connection with my liquid fuel atomizing device 5 described in my accompanying application filed Oct. 8, 1920, Serial No. 415,501.

The object of my invention is in the provision of a special draft means in conjunction with a liquid fuel atomizing device for W controlling the draft to the combustion chamber of furnace.

Another object of my invention is in the special means whereby the damper member is controlled by the action of the electric motor.

Other objects of my invention will appear in the following description in connection with the annexed drawings, in which Fig. 1 is a perspective view of the automatic draft regulator in connection with the liquid fuel atomizing device;

Fig. 2 is a plan view of the draft regulator;

8 and Fig. 1 is a detail view of the damper member in connection with a dash pot.

Referring to the drawings, A represents generally a liquid fuel atomizing device de scribed in another application. A shaft 10 projects outwardly from the electric motor in the aton'iizing outfit, and mounted on the outer end of said shaft is a fan 11, said fan being enclosed by the housing 12. The fan housin has suitable mounting in connection with the fuel mixing device, and at its outer end has an aperture 13, or rather an air intake for the fan. The housing 12 has at one side and integrally formed therewith a 9 dannier housing; 141, and said housing is conheeled with the draft pipe 15 which is inserted in the COIIIlH'lSlllOIl chamber of a furnace (not shown). A damper member 16 pivotally mounted at 17 has a suitable 5 mounting in the damper section to permit either an opening into the drafttube or a closing; thereof. An arm 18 is connected with the damper in such manner that any movement of said damper will result in a 3 corresponding movement of said arm.

Mounted on the outer end of the arm 18 is aweighted member 19 and adjustable on the arm, by means of the set screw 20. A bracket 21 is attached to the lower portion of the is an end elevation of the device,

weight arm 18, said bracket having a piv-' otal connection as at22 with the outer end of a plunger slidable in the dash pot 24-, said dash pot having suitable mounting as at 25 with the outer portion of the fan housing. The dash pot is of simple construction, having an air adjusting means 26 for regulating the compression within and thereby the movement of the plunger 28, with the result thatthe speed of movement of the weighted arm 18 and damper 16 is also determinable. A stop member 27 for the weighted arm is mounted on the outer sec tion of the fan blower just above the dash pot, and an adjustable mounting as at 28 is provided for said stop. When in closed position, the damper 16 abuts a lip stop 29 in connection with the damper housing. Projecting into the drafttube, at a point intermediate its ends and having its nozzle ap proximately even with the end of said tube, is a fuel tube 30. Mounted on the outside of the draft tube, and having connection with any suitable gas supply is a pilot light 31. The jet on said pilot light is approximately coincident with the end of the draft tube and fuel tube and has such mounting that the flame therefrom is capable of igniting the fuel mixture whenthe atomizing device is started.

The operation of the device is as follows: hen the liquid fuel atomizing device is started and the fuel under pressure is projected from the fuel tube 30, the pilot light lights said fuel and heat is generated there after within the combustion chamber.

The special draft arrangement above described is mounted in connection with the atomizing device, with the result that the draft in the combustion chamber may be aulouiatically regulated. In order that there may be a rich fuel mixture when the device is initially started, it is desirable that the damper u'ieinber be closed, or rather, that there be no draft to the combustion chamber.

When the atomizer started, the fan be ing mounted on the Seine shaft, rotates tim" mediately, and a pressure is brought against the damper member which is in the closed position, as shown in 3. The pressure gradually rising within the fan casing, grad ually forces the damper member downward- 1y to the position shown in Fig. 1'; however, the forcing down of the damper member,

due to the resistance in the dash pot, takes some time, and the time consumed in this opening of the damper permits the initial ignition of the rich fuel mixture within the combustion chamber. After initial ignition of the fuel mixture, it is desirable that there he a continuediorced draft and it willbe clearly seen that the continuation of rota: tion of the fan will keep the damper member constantly open and therefore a constant draft to the combustion chamber. Vith the cessation of actionof the atomizing device, or rather, with the stopping of the electric motor in connection therewith, the fan will cease its rotation also, and the pressure against the damper will he relieved, with theresult that the weigl'it arm 18 forced upardly hy the opening action of the damper member, will, through its weight, gradually more downwardly, resisted only by the pressure within the dash pot. This closing ac lion ol the damper inen'ihcr with the cessation of the ope 'ation ofthe device puts the latter in such condition that the initial ignition will take place again, with a tempo rarily closed draft.

I claim:

In a device of the character described, a cylindrical tan housing having a tangential projection therefrom, and a draft pipe arranged at right angles to said housing and conu'nunicating with the interior thereof through the side of said tangential projection. a rectangular damper pivoted within the circumference of the fan housing adjacent said projection adapted to cut oil the connnunication between the interior of the housing; and the tangential projection opcn ing into the draft )ipc, means for normally maintaining said damper in position to cut off said communication to prevent a hack draft through said draft pipe when the dc rice is quiet, and means allowing a gradual opening ot' the damper when the peration oi thedevice is started.

In testimony whereof I have attired my signature.

YVAIJlEl-t W. \VILLL at 

